More on the concentric ordered modulus algorithm for blind equalization of QAM and QPR modulations, with results for 64 QAM, 25 QPR and 49 QPR

The concentric ordered modulus algorithm (COMA) exhibits desired properties from the constant modulus algorithm (CMA) and decision directed algorithm in the blind equalization of QAM and QPR signals. These properties encompass an invariance to carrier modulation, probability distribution of constellation points, and correlation between symbols. Furthermore, it is shown that COMA converges faster than CMA for severely distorted channels. The author continues the development of the algorithm, with the results for 64 QAM, 25 QPR, and 49 APR signals. COMA´s nonlinear error generation precludes the use of classical closed-form analysis to insure an optimal design. Nevertheless, through the use of simulations, an algorithm and guidelines for the design are presented